Ruling · Yama Dvitīyā (Bhai Dooj) · 1921

Tuesday 1 November

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 284 minutes.

Decide it for

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Tuesday 1 November

Taken. The only midday Dvitīyā reaches.

madhyāhna begins 10:59  11:47 madhyāhna ends
10:1110:3510:5911:2311:4712:1112:35

48 of 48 minutes covered

Midday of Wednesday 2 November

Dvitīyā is absent from madhyāhna. Not taken.

madhyāhna begins 10:59  11:47 madhyāhna ends
10:1110:3510:5911:2311:4712:1112:35

0 of 48 minutes covered

Dvitīyā presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Dvitīyā runs from 06:15 on Tue 1 Nov to 05:24 on Wed 2 Nov.

    1921-10-31T22:15:11Z → 1921-11-01T21:23:57Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 10:59–11:47 on the 1st, 10:59–11:47 on the 2nd.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Dvitīyā must be present during madhyāhna. It covers 48 of 48 minutes on the 1st and 0 of 48 on the 2nd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: purvaviddha → only-day · margin 17052 s

  5. 05

    Ruling

    Yama Dvitīyā, Daqing, 1921: Tuesday 1 November.

    confidence: determinate

Say it like this

In Daqing, Yama Dvitīyā (Bhai Dooj) 1921 falls on Tuesday 1 November. Dvitīyā runs from 06:15 on Tue 1 Nov to 05:24 on Wed 2 Nov and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1921/yama-dvitiya · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 1 Nov
Ahargaṇa, classicalDisc centre, no refractionTue 1 Nov
compat-drikpanchangComparison profileTue 1 Nov
No institution has a recorded ruling for Daqing.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/yama-dvitiya · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Dvitīyā
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“S 2 Bhratrdvitiya, Yamadvitiya (madhyahna, purvaviddha), Masyadhara (Dwat) puja (Bihar).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvitīyāMadhyāhna 31stCoveredMadhyāhna 1stCoveredRuled
Los Angeles14:15 → 13:2411:120 min11:1248 min1 Nov
Chicago16:15 → 15:2411:100 min11:1048 min1 Nov
Jersey City17:15 → 16:2411:160 min11:1648 min1 Nov
Port of Spain18:15 → 17:2411:260 min11:2648 min1 Nov
London22:15 → 21:2411:200 min11:2048 min1 Nov
Durban00:15 → 23:2411:160 min11:1648 min1 Nov
Dubai02:15 → 01:2411:380 min11:3848 min1 Nov
Delhi03:45 → 02:5411:410 min11:4148 min1 Nov
Kolkata03:45 → 02:5410:560 min10:5648 min1 Nov
Singapore05:15 → 04:2411:240 min11:2448 min1 Nov
Sydney08:15 → 07:2411:150 min11:1548 min1 Nov
Suva10:15 → 09:2411:260 min11:2648 min1 Nov
Profile · tradition
pac-rp@2026.1 · smarta
Rule
yama-dvitiya@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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